                        課程
                    
                        /前端開發
                        
                            /HTML/CSS
                        
                        /企業網站綜合布局實戰

焦點圖切換按鈕只有上半部分點擊有用。。。什么情況

如題

????????<div?class="ad"?id="box">
????????????
????????????????<div?class="loading"><img?src="images/loading.gif"?alt="圖片加載中"/></div>
????????????????????<div?class="pic">
????????????????????????<ul>
????????????????????????????<li><img?src="images/ad2.jpg"/></li>
????????????????????????????<li><img?src="images/ad3.jpg"/></li>
????????????????????????????<li><img?src="images/ad4.jpg"/></li>
????????????????????????</ul>
????????????????????</div>
????????????
????????</div><!--ad結束-->

<head>
<meta?charset="utf-8">
<title>無標題文檔</title>
<link?href="css/main.css"?rel="stylesheet"?type="text/css"/>
<script?src="js/setHomeSetFav.js"?type="text/javascript"?charset="gb2312"></script>
<script?src="js/myfocus-2.0.1.min.js"?type="text/javascript"></script>
<script?src="js/mf-pattern/mF_fancy.js"?type="text/javascript"></script>
<link?href="js/mf-pattern/mF_fancy.css"?rel="stylesheet"?type="text/css"/>
<script?type="text/javascript">
	myFocus.set({
		id:'box',

	})
</script>
</head>

@charset?"utf-8";
/*?CSS?Document?*/
*{
	margin:0;
	padding:0;
	font-size:12px;	
}

body{
	background-color:#f5f5f5;
}

.top{
	width:100%;
	height:27px;
	background:url(../images/top_bg.jpg)?repeat-x;
}

.top_mid{
	width:1000px;
	margin:0?auto;
}

.top_mid?li{
	list-style-image:url(../images/li_bg.gif);
	float:right;
	width:70px;
	line-height:27px;
}

.top_mid?a:link,.top_mid?a:visited{
	color:#8e8e8e;
	text-decoration:none;
}
.top_mid?a:hover,.top_mid?a:active{
	color:#F00;
	text-decoration:none;
}
	
.wrap{
	width:1000px;
	margin:0?auto;
}
.logo{
	height:80px;
	background-color:#FFF;
}
.logo_left{
	width:200px;
	height:80px;
	float:left;
}
.logo_right{
	width:260px;
	float:right;
	height:28px;
	margin-top:25px;
	color:#8e8e8e;
	
}

.logo_right?img
{
	vertical-align:middle;
	margin-right:10px;
}

.tel{
	font-family:"微軟雅黑";
	color:#f00;
	font-size:16px;
}

.nav{
	margin-top:5px;
	height:40px;
}

.nav_left,.nav_mid,.nav_right{
	float:left;
	height:40px;
}

.nav_left{
	width:10px;
	background:url(../images/nav_left.jpg)?no-repeat;
}

.nav_mid{
	width:980px;
	background:url(../images/nav_bg.jpg)?repeat-x;
}

.nav_right{
	width:10px;
	background:url(../images/nav_right.jpg)?no-repeat;
}

.nav_mid_left,.nav_mid_right{
	float:left;
}

.nav_mid_left{
	width:680px;
}

.nav_mid_right{
	width:300px;
}

.nav_mid_left?li{
	float:left;
	line-height:40px;
	width:100px;
	list-style-type:none;
	text-align:center;
}

.nav_mid_left?a:link,.nav_mid_left?a:visited{
	color:#fff;
	text-decoration:none;
	font-size:16px;
	font-family:"微軟雅黑";
}
.nav_mid_left?a:hover,.nav_mid_left?a:active{
	color:#FF0;
	text-decoration:none;
	font-size:17px;
	font-family:"微軟雅黑";
}

.search_text{
	width:190px;
	height:25px;
	margin-top:6px;
	background:url(../images/search.jpg)?no-repeat?right?center;
	background-color:#FFF;
	padding-right:25px;
	border:1px?solid?#FFF;
}

.ad{
	height:310px;
	overflow:hidden;
}